Frequency discrimination method and device for automatic frequency controller in diversity mode

A technology of automatic frequency control and diversity mode, applied in the direction of selection device, code division multiplexing system, radio/inductive link selection arrangement, etc., can solve the problems of slow acquisition speed and inability to obtain correct frequency difference, etc. To achieve the effect of simplifying the design

Inactive Publication Date: 2003-02-12
HUAWEI TECH CO LTD
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Problems solved by technology

The above method can be used for correct and effective frequency discrimination, but on the one hand, the frequency discrimination result is one result obtained in two symbol sampling times, so compared with th

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  • Frequency discrimination method and device for automatic frequency controller in diversity mode
  • Frequency discrimination method and device for automatic frequency controller in diversity mode
  • Frequency discrimination method and device for automatic frequency controller in diversity mode

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[0027] figure 1 is a schematic diagram of a CPICH frequency difference detection pair in diversity mode. like figure 1 As shown, in the diversity mode, the frequency difference detection method is used for frequency discrimination, and the above method can be used for correct and effective frequency discrimination. than, the capture speed is about twice as slow; on the other hand, the pair of detection pairs at the frame head and frame tail cannot get the correct frequency difference.

[0028] figure 2 It is a schematic flow diagram of the method of the present invention, such as figure 2 As shown, in step S201, receive the common pilot signal after despreading and delete the frame header data of the first frame of said signal in step S202; If yes, the process enters step S204, the output data is zero, and enters step S206 for frequency discrimination, if it is judged to be negative in step S203, then the process enters step S205, the output data is equal to the input da...

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Abstract

A frequency discriminating method for AFC circuit in diversity mode includes such steps as deleting the head data of a first frame, filling zero to frame head and tail to generate continuous frequency difference detecting pairs, cross-multiplying the input signals of cross-multiplier, sending the said detecting pairs to the frequency discriminator to obtain frequency difference, and over sampling to obtain 2x samples for output. Its advantages are simple equipment and high speed.

Description

technical field [0001] The invention belongs to the technical field of synchronous application in communication technology, and more specifically relates to a frequency discrimination method and a device for an automatic frequency control circuit. Background technique [0002] In a WCDMA user terminal (WCDMA UE), a Common Pilot Channel (CPICH) signal is used to obtain frequency difference information to implement an Automatic Frequency Control (AFC) function. Sequence of symbols transmitted by CPICH. In the non-diversity mode, only one antenna transmits a symbol sequence, and in the diversity mode, two antennas transmit simultaneously. These contents are described in more detail in the 3GPP protocol TS25.211 V3.6.0 published in March 2001. [0003] In this way, in the non-diversity mode, the AFC circuit can adopt a frequency discriminator structure (take the cross-product frequency discriminator as an example), and the frequency difference can be obtained by taking the imag...

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Application Information

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IPC IPC(8): H04B1/707H04L27/00
Inventor 冯淑兰
Owner HUAWEI TECH CO LTD
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